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FAIR VALUES - Fair Equity Instruments (Details) - ARS ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value measurement of assets and liability [line items]      
Equity instruments measured at Fair Value with changes in profit or loss $ 9,871,903 $ 773,961 $ 31,649,050
Equity investments      
Disclosure of fair value measurement of assets and liability [line items]      
Equity instruments measured at Fair Value with changes in profit or loss 87,131 7,891  
Grupo Financiero Galicia S.A.      
Disclosure of fair value measurement of assets and liability [line items]      
Equity instruments measured at Fair Value with changes in profit or loss 74,881 $ 7,891  
Pampa Holding S.A      
Disclosure of fair value measurement of assets and liability [line items]      
Equity instruments measured at Fair Value with changes in profit or loss 8,286    
Loma Negra S.A.      
Disclosure of fair value measurement of assets and liability [line items]      
Equity instruments measured at Fair Value with changes in profit or loss 3,179    
Others      
Disclosure of fair value measurement of assets and liability [line items]      
Equity instruments measured at Fair Value with changes in profit or loss $ 785